British ones ARE regular soldiers, and theyre on duty. For reals for reals. Its for show yes, but officially they ARE on duty and have proper powers and authority. They still exist because, again officially speaking, the Commander of the military needs guarding because *he is the Commander of the military*.
Its actually a VERY saught after position. Soldiers want it and are proud to do it. As for enduring it, iirc they use micro-movements in their legs to keep going for a long time.
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